Hi,
try this code:
div.wpforms-container-full,
.elementor-224 .elementor-element.elementor-element-9f6299a > .elementor-widget-container,
.elementor-224 .elementor-element.elementor-element-eb62dc6 > .elementor-widget-container
{
background-color: rgba(255, 255, 255, .0)!important;
}
Regards